Infamous murders share one thing: they fascinate us. We can't turn away from these cases, mesmerized by the shocking details, tantalizing clues, bizarre twists. Cases such as Tupac, Casey Anthony, and JonBenet Ramsey left us dissatisfied, their controversial investigations failing to provide closure. The series will tell these stories once again, searching for the answers we all seek. Marcia Clark, newly recalled to the public's attention through The People v. O. J. Simpson, will serve as series host using her vast knowledge of homicide procedure to help lead us through mountains of evidence, both old and new. The series will re-examine famous cases in a unique and proprietary way - through the lens of A&E's flagship series, The First 48. Our distinct approach will reveal new information, and possibilities, as we unravel the mystery and come up with new theories on how the murder happened and why.